Two killed in San Francisco jet crash

An Asiana Airlines Boeing 777 is seen on the runway at San Francisco International Airport after crash landing on Sunday. (Josh Edelson, AFP)

Two 16-year-old Chinese students planning a tour of the US were killed. They had been sitting at the back of the plane and died as the tail separated from the bulkhead. Their bodies were found on the runway. (AFP)

The shutdown of an important navigational guidance system may provide a clue as to why the South Korean passenger jet crashed in San Francisco, the head of the US oversight authority said on Sunday. (Josh Edelson, AFP)

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The Asiana flight data recorder (L) and cockpit voice recorder (R) in a Washington, DC lab. US officials were combing through the wreckage of an Asiana Airlines Boeing 777 passenger jet as they tried to determine why it crashed onto the runway killing two people and injuring 182 others. (AFP)